Implantation???

A few days ago I felt a little crampy,more so like a pinching cramp on the right side off and on throughout the day. The day after,I was so crampy that I thought AF was making an appearance,she isn't due until 1/8. Since then,nothing. Breasts are swollen,but aren't as tender unless I poke at them. Could it be possible implantation? Share your thoughts, please!